<p> Impulse, Momentum and Conservation of Momentum</p><p>1. A 60 gram ball is hit with a stick and given a velocity of 75 m/s. If the stick exerted an average force of 3E4 N, what was the time of impact between the stick and the ball?</p><p>2. A running back, weighing 900N and moving at 2 m/s, is stopped in 0.70 seconds when hit by another player.</p><p> a. What average force did the player exert on the running back?</p><p> b. How much did the running back’s momentum change?</p><p>3. Identical twins, each weighing 500 N, are riding in a car traveling at 20 m/s. One of the girls is wearing a seat belt and the other is not (bad girl). The car is in an accident where the girl wearing the seat belt is brought to a rest in 0.120 seconds and the dashboard brings the other girl to a stop in only 0.0080 seconds.</p><p> a. What is the impulse each girl experiences?</p><p> b. What is the force exerted on each girl?</p><p>4. A rocket weighing 1.2E5N experiences an upward thrust of 2E5 N for about 1.5 minutes during take off.</p><p> a. What is the impulse exerted on the rocket?</p><p> b. What is the velocity of the rocket at the end of the 1.5 minute period?</p><p>5. A bowling ball of mass 8 kg is moving at 10 m/s when it strikes a 1.5 kg pin. After being hit, the pin flies backward (in the same direction that the ball was traveling) at 20 m/s while the ball continues in the same direction. What is the speed of the ball after impact?</p><p>6. A less than intelligent inventor designs a very lightweight gun that shoots heavy bullets. The 50 N bullet leaves the 40 N gun with a velocity of 200m/s. What is the recoil velocity of the gun?</p><p>7. A loaded freight car of mass 5000 kg breaks away and moves down the track with a speed of 4 m/s. It collides with two stationary cars of mass 1500 kg each. If they all couple together, what speed do they move down the track?</p><p>8. An ice-hockey player who weighs 900 N is skating with a velocity of 8 m/s when he slams into a member of the opposing team who is standing still. They become tangled together and move down the ice with a velocity of 5m/s. What is the weight of the other player?</p>